* Changed the package to allow for external packages to provide additional checking. (Closes atom#74)
  - Disabled the task-based handling because of passing plugins.
  - Two default plugins are included: system-based dictionaries and "known words".
  - Suggestions and "add to dictionary" are also provided via interfaces. (Closes atom#10)
  - Modified various calls so they are aware of the where the buffer is located.
* Modified system to allow for multiple plugins/checkers to identify correctness.
  - Incorrect words must be incorrect for all checkers.
  - Any checker that treats a word as valid is considered valid for the buffer.
* Extracted system-based dictionary support into separate checker.
  - System dictionaries can now check across multiple system locales.
  - Locale selection can be changed via package settings. (Closes atom#21)
  - Multiple locales can be selected. (Closes atom#11)
  - External search paths can be used for Linux and OS X.
  - Default language is based on the process environment, with a fallback to the browser, before finally using `en-US` as a fallback.
* Extracted hard-coded approved list into a separate checker.
  - User can add additional "known words" via settings.
  - Added an option to add more known words via the suggestion dialog.
* Updated ignore files and added EditorConfig settings for development.
* Various coffee-centric formatting.

- Switched to a task-based system.
    - Reworked the plugins so they return full paths to a `require`able instance.
    - Modified the activation/deactivation to create a single background task for all checking.
    - Initial request for corrections will have a delay while an in-process manager is created.
    - Added flow control via `send` and `emit` to communicate configuration changes with the task process.
- Changed to a word-based searching implementation.
    - Added a simplified tokenizer that includes some accented characters.
    - An internal cache is used for a single round of check to reduce overhead.
    - Removed the use of integer ranges and simplified processing logic.
- Removed a number of `console.log` calls used for debugging.
- Updated documentation.
    - Split out plugin creation into a separate document with a reference in the `README.md`.

…ecking.

* Updated unit tests to verify functionality of multiple plugin responses.
* Taught system checking how to identify correct as well as incorrect.
* Updated documentation to reflect plugin logic.

* Removed ".coffee" from require statements.
* Moved empty array initialization closer to where it was populated.